Completely disable r63462 for now to avoid CRAN failures.


git-svn-id: https://svn.r-project.org/R/trunk@63472 00db46b3-68df-0310-9c12-caf00c1e9a41
grid.show*() : allow to change vp.ex from 0.8

git-svn-id: https://svn.r-project.org/R/trunk@63473 00db46b3-68df-0310-9c12-caf00c1e9a41
more clearly mention important functions by name;
add markup, notably \link{}s.


git-svn-id: https://svn.r-project.org/R/trunk@63474 00db46b3-68df-0310-9c12-caf00c1e9a41